The 14.3-inch display is energy efficient, of course, because it doesn't need backlighting and will still be visible even under direct sunlight. Moreover, the image on the display is retained even without constant refreshing, so that's another point that saves power. The same electrophoretic display technology used for this device can also be used for other gadgets as well. In fact, the technology is highly-suitable as a display for mobile devices to improve their battery life and of course, as ordinary e-paper.